Question: Which Christian Church has the pope as the office held by the head of the organisation?
Paraphrase: Which Christian Church is the head of the organization holding the pope as the office?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P2388 wd:Q19546 . ?sbj wdt:P31 wd:Q34651 } 
Answer: Catholic Church